llDumpList2String: Always optimize SEF lists of 1 element

lslopt/lslfuncopt.py

@@ -169,6 +169,12 @@ def OptimizeFunc(self, parent, index):
                 parent[index] = nr(nt='CONST', t='string', value=u'', SEF=True)
                 return
 
+            if list_len == 1:
+                # A single-element list can always be transformed regardless of
+                # the presence of function calls
+                parent[index] = CastDL2S(self, child[0], 0)
+                return
+
             # Only optimize if the second param is a very simple expression,
             # otherwise the sums can get large.
             if child[1].nt in ('CONST', 'IDENT'):